I have added a custom background to the site and I use a Firefox plugin called SEO doctor which looks at the elements in the site. What i have noticed is that the new custom background does not have an Alt tag associated with it .

I though that images with the csss of site never used Alt attribute but SEO doctor is picking up the background as an image n the site. Is there anywhere that I can just add the Alt attribute to the code so it gets a 100% report.